含水率对于地下结构地震动力响应的影响研究
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摘要
含水率对土体的弹性模量、黏聚力、内摩擦角以及土体密度都会产生影响.密实度一定的情况下,黏性土的多种力学参数会随着最佳含水率的出现而出现"峰值"效应.利用FLAC3D差分软件对不饱和土在地震作用下的动力响应进行了模拟和分析,探讨了土中含水率对于地下结构地震动力响应的影响规律.结果表明,在最佳含水率附近,土层的性质对于地下结构的作用来说是最良好的,此时结构的内力可取得最小值;顶板和底板的相对水平位移变化不大,并且位移的数值随着含水率的增加而逐渐减小;土体和结构的加速度峰值都随着含水率的增加而呈减小的趋势.
Moisture content of soil has definite effects on elasticity modulus,cohesion,internal friction angle and density of soil.Given compactness of soil,several mechanical parameters of soil will have"peak value"effect at the optimum moisture content.In this paper simulation and analysis on dynamic responses of unsaturated soil under seismic excitations are carried out by using Flac3 D finite difference software,and the effect of moisture content on dynamic responses of underground structure under seismic excitations is investigated.Analysis results show that properties of soil at the optimum water content are optimal for the seismic responses of underground structures,because in this case the internal forces achieve the minimum values; the relative horizontal displacement of top and bottom slabs has not significant change,and the values of displacement are gradually decreasing with the increase of water content; and so does the maximum accelerations of soil and structure with the increase of water content.
Moisture content of soil has definite effects on elasticity modulus,cohesion,internal friction angle and density of soil.Given compactness of soil,several mechanical parameters of soil will have"peak value"effect at the optimum moisture content.In this paper simulation and analysis on dynamic responses of unsaturated soil under seismic excitations are carried out by using Flac3 D finite difference software,and the effect of moisture content on dynamic responses of underground structure under seismic excitations is investigated.Analysis results show that properties of soil at the optimum water content are optimal for the seismic responses of underground structures,because in this case the internal forces achieve the minimum values; the relative horizontal displacement of top and bottom slabs has not significant change,and the values of displacement are gradually decreasing with the increase of water content; and so does the maximum accelerations of soil and structure with the increase of water content.
引文
[1]赵成刚.土力学原理[M].北京:清华大学出版社,2004:1-8
[2]罗小龙.含水率对粘性土体力学强度的影响[J].岩土工程界,2002,5(7):52-53
[3]俞培基,陈愈炯.非饱和土的水-气形态及其与力学性质的关系[J].水利学报,1965(1):16-23
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[5]张林洪,靳娟娟,丁磊,等.高含水率土体强度与含水率和密度的关系研究[J].云南水力发电,2010,26(2):42-44
[6]刘江平,罗银河,张英德.黏土动静弹性模量相关性试验研究[J].岩石力学与工程学报,2007,26(2):427-432
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[9]党靖,胡李俐,南帅.含水量及天然密度对土体抗剪强度参数的影响研究[J].中国西部科技,2007(5):14-15
[10]GB T50123—1999.土工试验方法标准[S]
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[12]刘卫中,曾国良.关于轻型击实试验制备试样加水量的探讨[J].西部探矿工程,2006,17(12):146-147
[13]常士骠.工程地质手册[M].北京:中国建筑工业出版社,2007:274-275
[14]李围.隧道及地下工程FLAC解析方法[M].北京:中国水利水电出版社,2009:38-39
[15]陈健云,温瑞智,于品清,等.浅埋软土地铁车站地震响应数值分析[J].世界地震工程,2009(2):46-53
[16]Lysmer J.Finite dynamic model for infinite media[J].ASCE,Journal of Engineering Mechanics,1969,95(4):859-877
[17]黄营,陈国兴,戚承志,等.可液化场地框架式地铁车站结构振动台模型试验与数值模拟的对比分析[J].岩土工程学报,2013,35(S2):471-478
[18]庄海洋.土-地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006
[2]罗小龙.含水率对粘性土体力学强度的影响[J].岩土工程界,2002,5(7):52-53
[3]俞培基,陈愈炯.非饱和土的水-气形态及其与力学性质的关系[J].水利学报,1965(1):16-23
[4]徐艳玲,唐伯明,谢国栋,等.不同含水率下应力级位对粘性土动回弹模量的影响[J].中外公路,2012,31(6):68-72
[5]张林洪,靳娟娟,丁磊,等.高含水率土体强度与含水率和密度的关系研究[J].云南水力发电,2010,26(2):42-44
[6]刘江平,罗银河,张英德.黏土动静弹性模量相关性试验研究[J].岩石力学与工程学报,2007,26(2):427-432
[7]黄琨,万军伟,陈刚,等.非饱和土的抗剪强度与含水率关系的试验研究[J].岩土力学,2012,33(9):2600-2604
[8]常立君,张吾渝,马艳霞.非饱和土抗剪强度与含水率的关系研究[J].山西建筑,2012,38(22)
[9]党靖,胡李俐,南帅.含水量及天然密度对土体抗剪强度参数的影响研究[J].中国西部科技,2007(5):14-15
[10]GB T50123—1999.土工试验方法标准[S]
[11]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社,1994:66-71
[12]刘卫中,曾国良.关于轻型击实试验制备试样加水量的探讨[J].西部探矿工程,2006,17(12):146-147
[13]常士骠.工程地质手册[M].北京:中国建筑工业出版社,2007:274-275
[14]李围.隧道及地下工程FLAC解析方法[M].北京:中国水利水电出版社,2009:38-39
[15]陈健云,温瑞智,于品清,等.浅埋软土地铁车站地震响应数值分析[J].世界地震工程,2009(2):46-53
[16]Lysmer J.Finite dynamic model for infinite media[J].ASCE,Journal of Engineering Mechanics,1969,95(4):859-877
[17]黄营,陈国兴,戚承志,等.可液化场地框架式地铁车站结构振动台模型试验与数值模拟的对比分析[J].岩土工程学报,2013,35(S2):471-478
[18]庄海洋.土-地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006
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